这个是基本的连接数据库代码(注意要加入连接oracle数据库的jar包)：
导入的数据库就是String sc="jdbc:oracle:thin:@192.168.1.223:1521:test";对应的test数据库，所有的表结构都可以导出来。（需要修改为自己对应的ip和端口和数据库名称，上面的是我的地址和数据库）
Java代码 收藏代码
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
public class ConnectionOracle {
/**
* @param args
*/
String sd="oracle.jdbc.driver.OracleDriver";
// String sc="jdbc:oracle:thin:@192.168.1.170:1521:cst";
String sc="jdbc:oracle:thin:@192.168.1.223:1521:test";
String userName = "adminss";
String password = "123456";
// String sd="com.mysql.jdbc.Driver";
// String sc="jdbc:mysql://localhost:3306/payManagerDB?useUnicode=true&characterEncoding=utf8";
Connection con=null;
Statement stmt=null;
ResultSet rs=null;
public ConnectionOracle()
{
try
{
Class.forName(sd);
}
catch(Exception e)
{
System.err.println(e.getMessage());
}
}
public static void main(String[] args) {
// TODO Auto-generated method stub
}
public ResultSet executeQuery(String sql) throws SQLException
{
con=DriverManager.getConnection(sc,userName,password);
Statement stmt=con.createStatement();
rs=stmt.executeQuery(sql);
return rs;
}
public void executeUpdate(String sql) throws SQLException
{
con=DriverManager.getConnection(sc,userName,password);
Statement stmt=con.createStatement();
stmt.executeUpdate(sql);
}
public void close() throws SQLException
{
if(rs!=null)
rs.close();
if(stmt!=null)
stmt.close();
if(con!=null)
con.close();
}
}
下面的代码读取数据库中所有表以及结构到excel中（如果出现问题，首先看是不是你已经打开了这个excel，要先关闭）：
Java代码 收藏代码
import java.io.File;
import java.io.FileOutputStream;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import org.apache.poi.hssf.usermodel.HSSFCell;
import org.apache.poi.hssf.usermodel.HSSFCellStyle;
import org.apache.poi.hssf.usermodel.HSSFFont;
import org.apache.poi.hssf.usermodel.HSSFRichTextString;
import org.apache.poi.hssf.usermodel.HSSFRow;
import org.apache.poi.hssf.usermodel.HSSFSheet;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.hssf.util.Region;
/**
* 将oracle中的数据表结构导入到excel中保存
* @class DataToExcel
* @description
* @author 李智慧
* @copyRight copyright(c) 2011 广东南航易网通电子商务有限公司,Rights Reserved
* @time Dec 27, 2011 10:02:08 AM
*/
public class DataToExcel {
public static void main(String[] args) {
String result = "";
List listAll = new ArrayList();
System.out.println("正在读取数据库中所有的表");
try {
List tableList = getTableList();
System.out.println("数据库表读取完成");
for(int i=0;i<tableList.size();i++){
String[] strings = (String[]) tableList.get(i);
String tableName = strings[0].toString();
List list = new ArrayList();
list.add(tableName);
list.add(getStructOfTable(tableName));
System.out.println("正在生成表"+tableName+"的结构");
listAll.add(list);
}
result = TableStructInfoToExcel(listAll,"D:");
System.out.println("数据库中表结构导入已完成");
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
File file = new File(e.getMessage().toString());
if(file.exists()){
file.delete();
}
}
System.out.println(result);
//showView(list);
}
/**
* 获取数据库中所有的表
* @return
*/
public static List getTableList(){
String sql = "select object_name From user_objects Where object_type='TABLE'";
return getResult(sql,1);
}
/**
* 根据表明
* @param tableName
* @return
*/
public static List getStructOfTable(String tableName){
String sql = "SELECT u.column_name,u.data_type,u.data_length,u.data_precision,u.data_Scale,u.nullable,u.data_default,c.comments FROM user_tab_columns u,user_col_comments c"+
" WHERE u.table_name='"+tableName+"' and u.table_name=c.table_name and c.column_name=u.column_name";
return getResult(sql,8);
}
/**
* 获取结果的公用类
* @param sql
* @param length
* @return
*/
public static List getResult(String sql,int length){
List list = new ArrayList();
ResultSet rs=null;
ConnectionOracle c=new ConnectionOracle();
try {
rs=c.executeQuery(sql);
while(rs.next()){
String[] string = new String[length];
for(int i=1;i<length+1;i++){
string[i-1] = rs.getString(i);
}
list.add(string);
}
c.close();
} catch (SQLException e) {
e.printStackTrace();
}
return list;
}
/**
* 输出对应list中的数据
* @param list
*/
public static void showView(List list){
for (Iterator iterator = list.iterator(); iterator.hasNext();) {
String[] name = (String[]) iterator.next();
for (int i = 0; i < name.length; i++) {
System.out.println(name[i]);
}
}
}
/**
* 将数据导入到excel中
* @param list
* @param tableName
* @param path
* @return
* @throws Exception
*/
public static String TableStructInfoToExcel(List list,String path) throws Exception {
String FileName="";
FileOutputStream fos = null;
HSSFRow row = null;
HSSFCell cell = null;
HSSFCellStyle style = null;
HSSFFont font = null;
int currentRowNum = 0;
String[] tableFiled = {"column_name","data_type","data_length","data_precision","data_Scale","nullable","data_default","comments"};
try{
FileName = path +"\\"+"CSN数据库中表结构.xls";
fos = new FileOutputStream(FileName);
//创建新的sheet并设置名称
HSSFWorkbook wb = new HSSFWorkbook();
HSSFSheet s = wb.createSheet();
wb.setSheetName(0, "CSN数据库表结构");
style = wb.createCellStyle();
font = wb.createFont();
for(int z=0;z<list.size();z++){
List listBean = (List) list.get(z);
//新建一行,再在行上面新建一列
row = s.createRow(currentRowNum);
int pad = currentRowNum;
currentRowNum++;
//设置样式
font.setBoldweight(HSSFFont.BOLDWEIGHT_BOLD); //字体加粗
style.setFont(font);
style.setAlignment(HSSFCellStyle.ALIGN_CENTER);//水平居中
style.setFillForegroundColor((short) 13);// 设置背景色
style.setFillPattern(HSSFCellStyle.SOLID_FOREGROUND);
style.setBorderBottom(HSSFCellStyle.BORDER_THIN); //下边框
style.setBorderLeft(HSSFCellStyle.BORDER_THIN);//左边框
style.setBorderTop(HSSFCellStyle.BORDER_THIN);//上边框
style.setBorderRight(HSSFCellStyle.BORDER_THIN);//右边框
for(int i=0;i<tableFiled.length;i++){
cell = row.createCell((short) i);
cell.setCellValue("");
cell.setCellStyle(style);
}
row.getCell((short) 0).setCellValue("数据库表"+listBean.get(0).toString()+"的结构");
//创建第二行
row = s.createRow(currentRowNum);
currentRowNum++;
for(int i=0;i<tableFiled.length;i++){
//创建多列并设置每一列的值和宽度
cell = row.createCell((short) i);
cell.setCellValue(new HSSFRichTextString(tableFiled[i]));
s.setColumnWidth((short)i,(short)5000);
}
List list2 = (List) listBean.get(1);
for(int i=0;i<list2.size();i++){
row = s.createRow(currentRowNum);
currentRowNum++;
String[] strings = (String[]) list2.get(i);
for(int j=0;j<strings.length;j++){
cell = row.createCell((short) j);
cell.setCellValue(new HSSFRichTextString(strings[j]));
}
}
//合并单元格
s.addMergedRegion(new Region(pad,(short)0,pad,(short)(tableFiled.length-1)));
currentRowNum ++;
}
wb.write(fos);
fos.close();
}catch (Exception e) {
e.printStackTrace();
fos.close();
throw new Exception(FileName);
}
return FileName;
}
}
最后总结一下：
关键性的代码：
一：读取数据库中的所有表
Java代码 收藏代码
select object_name From user_objects Where object_type='TABLE';
二：读取对应表中的结构，下面测试是用CITYNB（这里没有加主键和外键信息，以后加上，有兴趣的朋友可以自己完成，弄好以后，希望给我借鉴一下，呵呵，相互学习嘛，如果还有问题，请联系我：[email protected]）
Java代码 收藏代码
SELECT u.column_name,u.data_type,u.data_length,u.data_precision,u.data_Scale,u.nullable,u.data_default,c.comments FROM user_tab_columns u,user_col_comments c
WHERE u.table_name='CITYNB' and u.table_name=c.table_name and c.column_name=u.column_name;
因为需要写数据库文档，所以需要把数据库里边的表结构在word中用表格列出来，之前一直用powerdesigner，感觉有些麻烦，后来在网上找到了一段sql语句，经测试完全符合我的需求，不敢独享，语句如下：
SELECT t1.Table_Name AS "表名称",
t3.comments AS "表说明",
t1.Column_Name AS "字段名称",
t1.Data_Type AS "数据类型",
t1.Data_Length AS "长度",
t1.NullAble AS "是否为空",
t2.Comments AS "字段说明",
t1.Data_Default "默认值"
FROM cols t1 left join user_col_comments t2
on t1.Table_name=t2.Table_name and t1.Column_Name=t2.Column_Name
left join user_tab_comments t3
on t1.Table_name=t3.Table_name
WHERE NOT EXISTS ( SELECT t4.Object_Name FROM User_objects t4
WHERE t4.Object_Type='TABLE'
AND t4.Temporary='Y'
AND t4.Object_Name=t1.Table_Name )
ORDER BY t1.Table_Name, t1.Column_ID;
查询完成后，粘贴指定的列即可
spool C:\sql_ddl.txt;
select dbms_metadata.get_ddl('TABLE','TABLE_NAME') FROM dual;
spool off;
-- TABLE_NAME 是你的表名
-- 然后打开C:\sql_ddl.txt文件，里面有你要的代码！
转导出oracle数据库所有表结构到excel、world中
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转载自zhyp29.iteye.com/blog/2352610
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